(Delphi DLL) AddDetachedSignaturePk

Demonstrates how to add a detached signature using a certifcate and it's corresponding private key. The easiest way of doing it is when both the certificate and private key are contained together within a PFX (.pfx or .p12) file. This example demonstrates how to use the certificate and its corresponding private key when they are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Mime, PrivateKey, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mime: HCkMime;
cert: HCkCert;
success: Boolean;
privKey: HCkPrivateKey;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

mime := CkMime_Create();

// Load the certificate from a .cer file.
cert := CkCert_Create();
success := CkCert_LoadFromFile(cert,'aaworkarea/myCert.cer');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// Load the private key from an encrypted PEM file.
// (A private key can be loaded from other file formats also..)
privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadEncryptedPemFile(privKey,'aaworkarea/myPrivateKey.pem','myPassword');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

success := CkMime_SetBodyFromPlainText(mime,'This is the plain-text MIME body.');

// Sign the MIME (adds a PKCS7 detached signature)
success := CkMime_AddDetachedSignaturePk(mime,cert,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

// Save the S/MIME to a file.
success := CkMime_SaveMime(mime,'aaworkarea/signedMime.txt');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

Memo1.Lines.Add('success!');

CkMime_Dispose(mime);
CkCert_Dispose(cert);
CkPrivateKey_Dispose(privKey);

end;